Skip shipit benchmark because sassc is not working with artifact under the ext directory.

https://github.com/ruby/ruby/actions/runs/21970480259/job/63470652855

Author: hsbt

.github/workflows/zjit-macos.yml

@@ -158,7 +158,7 @@ jobs:
         include:
           # Test --call-threshold=2 with 2 iterations in total
           - ruby_opts: '--zjit-call-threshold=2'
-            bench_opts: '--warmup=1 --bench=1 --excludes=lobsters'
+            bench_opts: '--warmup=1 --bench=1 --excludes=lobsters,shipit'
             configure: '--enable-zjit=dev_nodebug' # --enable-zjit=dev is too slow
 
     runs-on: macos-14

.github/workflows/zjit-ubuntu.yml

@@ -215,7 +215,7 @@ jobs:
         include:
           # Test --call-threshold=2 with 2 iterations in total
           - ruby_opts: '--zjit-call-threshold=2'
-            bench_opts: '--warmup=1 --bench=1 --excludes=lobsters'
+            bench_opts: '--warmup=1 --bench=1 --excludes=lobsters,shipit'
             configure: '--enable-zjit=dev_nodebug' # --enable-zjit=dev is too slow
 
     runs-on: ubuntu-24.04